rdtsc.h

实时监控

/*
 *	An alternative of the "RDTSC" instruction
 *	by Mr.Nodman
 *	2003-12-03
 */

#ifndef _RDTSC_H
#define _RDTSC_H

#pragma warning(disable:4035)	// disable warning: "no return value"
extern ULONGLONG get_tick_count()
{
	/*
	 *	high precision version "GetTickCount"
	 *	which could read time interval up to nano-second
	 *
	 *	the following instructions are equal to instruction "rdtsc"
	 *	after execution an unsigned __int64 integer is 
	 *	pushed into stack as a return value.
	 *	that is what we want.
	 *
	 *	ok, some versions of compilers recognize "RDTSC"
	 */
	__asm _emit 0x0f
	__asm _emit 0x31
	//__asm rdtsc
}
#pragma warning(default:4035)

#endif